from The American Heritage® Dictionary of the English Language, 4th Edition
- n. The radiant energy of electromagnetic waves in the visible portion of the electromagnetic spectrum.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. The radiant energy of the visible portion of a spectrum of light
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the energy associated with visible light
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